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/**
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*
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*  Base64 encode / decode
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*  http://www.webtoolkit.info/
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*
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**/
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var Base64 = {
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	// private property
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	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
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	// public method for encoding
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	encode : function (input) {
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		var output = "";
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		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
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		var i = 0;
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		input = Base64._utf8_encode(input);
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		while (i < input.length) {
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			chr1 = input.charCodeAt(i++);
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			chr2 = input.charCodeAt(i++);
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			chr3 = input.charCodeAt(i++);
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			enc1 = chr1 >> 2;
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			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
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			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
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			enc4 = chr3 & 63;
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			if (isNaN(chr2)) {
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				enc3 = enc4 = 64;
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			} else if (isNaN(chr3)) {
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				enc4 = 64;
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			}
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			output = output +
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			this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
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			this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
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		}
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		return output;
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	},
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	// public method for decoding
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	decode : function (input) {
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		var output = "";
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		var chr1, chr2, chr3;
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		var enc1, enc2, enc3, enc4;
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		var i = 0;
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		input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
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		while (i < input.length) {
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			enc1 = this._keyStr.indexOf(input.charAt(i++));
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			enc2 = this._keyStr.indexOf(input.charAt(i++));
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			enc3 = this._keyStr.indexOf(input.charAt(i++));
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			enc4 = this._keyStr.indexOf(input.charAt(i++));
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			chr1 = (enc1 << 2) | (enc2 >> 4);
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			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
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			chr3 = ((enc3 & 3) << 6) | enc4;
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			output = output + String.fromCharCode(chr1);
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			if (enc3 != 64) {
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				output = output + String.fromCharCode(chr2);
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			}
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			if (enc4 != 64) {
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				output = output + String.fromCharCode(chr3);
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			}
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		}
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		output = Base64._utf8_decode(output);
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		return output;
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	},
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	// private method for UTF-8 encoding
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	_utf8_encode : function (string) {
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		string = string.replace(/\r\n/g,"\n");
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		var utftext = "";
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		for (var n = 0; n < string.length; n++) {
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			var c = string.charCodeAt(n);
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			if (c < 128) {
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				utftext += String.fromCharCode(c);
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			}
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			else if((c > 127) && (c < 2048)) {
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				utftext += String.fromCharCode((c >> 6) | 192);
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				utftext += String.fromCharCode((c & 63) | 128);
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			}
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			else {
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				utftext += String.fromCharCode((c >> 12) | 224);
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				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
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				utftext += String.fromCharCode((c & 63) | 128);
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			}
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		}
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		return utftext;
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	},
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	// private method for UTF-8 decoding
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	_utf8_decode : function (utftext) {
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		var string = "";
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		var i = 0;
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		var c = c1 = c2 = 0;
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		while ( i < utftext.length ) {
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			c = utftext.charCodeAt(i);
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			if (c < 128) {
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				string += String.fromCharCode(c);
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				i++;
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			}
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			else if((c > 191) && (c < 224)) {
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				c2 = utftext.charCodeAt(i+1);
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				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
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				i += 2;
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			}
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			else {
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				c2 = utftext.charCodeAt(i+1);
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				c3 = utftext.charCodeAt(i+2);
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				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
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				i += 3;
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			}
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		}
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		return string;
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	}
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}
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